解答计算,三角函数

2025-05-09 19:19:33
推荐回答(2个)
回答1:

回答2:

cos30° = 1-2(sin15°)^2
(sin15°)^2 = (2-√3) /4

sin15° = √2(√3 -1)/4

8sin15°/sin30°
=16sin15°
=4√2(√3 -1)